Oncopagurus cidaris Lemaitre, 1996

Lemaitre, Rafael, 2014, A worldwide taxonomic and distributional synthesis of the genus Oncopagurus Lemaitre, 1996 (Crustacea: Decapoda: Anomura: Parapaguridae), with descriptions of nine new species, Raffles Bulletin of Zoology 62, pp. 210-301: 229-231

publication ID

http://doi.org/10.5281/zenodo.5458372

publication LSID

lsid:zoobank.org:pub:08BE1873-6F6F-4255-9520-9A89F48E4F16

persistent identifier

http://treatment.plazi.org/id/8C6A8943-FFE8-7862-FF18-F9C4FA4CF886

treatment provided by

Tatiana

scientific name

Oncopagurus cidaris Lemaitre, 1996
status

 

Oncopagurus cidaris Lemaitre, 1996  

Figs. 10A–J View Fig , 51 View Fig

Oncopagurus cidaris Lemaitre, 1996: 204   View Cited Treatment , figs 22, 23 (type locality: off Tully, Queensland, Australia, CIDARIS I, sta 1–3, 18°07.9'S, 147°35.7'E); Zhadan, 1997: 63 (table); Davie, 2002: 88; Poore, 2004: 282, fig. 81a; McLaughlin et al., 2010: 39.

Type material. Holotype, off Tully , Queensland, Australia, CIDARIS I sta 1–3, 18°07.9'S, 147°35.7'E, 956–969 m, 6 May 1986: M 2.6 mm ( QM W16596 View Materials ). GoogleMaps  

Paratypes: see Lemaitre (1996).

Additional material. Philippines: MUSORSTOM 3: sta CP 88, 14°00'S, 120°17'E, 183–187 m, 31 May 1985: 1 M 2.5 mm, 1 ov F 2.3 mm ( MNHN Pg.); sta CP 91, 14°00'S, 120°18'E, 190–203 m, 31 May 1985: 1 M 1.9 mm ( MNHN Pg.); sta CP 100, 14°00'S, 120°18'E, 189–199 m, 1 June 1985: 1 M 2.3 mm ( MNHN Pg.) GoogleMaps   .

Diagnosis. Shield ( Fig. 10A View Fig ) as broad as long; rostrum broadly rounded, weakly produced, with short mid-dorsal ridge; lateral projections subtriangular, terminating bluntly. Ocular peduncles more than half length of shield, with dorsal row of long setae; corneas weakly dilated. Ocular acicles subtriangular, terminating in strong spine. Antennular peduncle ( Fig. 10A View Fig ) exceeding distal margin of cornea by entire length of ultimate segment. Antennal peduncle ( Fig. 10A View Fig ) reaching distal margin of cornea; fourth segment with strong dorsodistal spine; second segment with terminating in strong, simple spine, mesial margin with spine on dorsodistal angle; first segment with 1 small spine on lateral face; acicle slightly curved outward (in dorsal view), at most slightly exceeding distal margin of cornea, terminating in strong spine, mesial margin armed with row of 5–9 spines; flagellum exceeding extended right cheliped, articles with numerous setae <1–3 flagellar articles in length. Third maxilliped with crista dentata of about 8 teeth, proximal 2 or 3 teeth distinctly larger than distal teeth. Right cheliped ( Fig. 10B, C View Fig ) with chela operculate, having moderately dense, plumose setae on distal half of chela; dactyl set at strongly oblique angle to longitudinal axis of palm; palm longer than broad, dorsal surface smooth except for scattered small tubercles, lateral margin well delimited by row of blunt to sharp spines, mesial face rounded, dorsomesial margin delimited by row of small blunt or sharp spines, ventral surface smooth; carpus with dorsolateral margin rounded or sometimes well delimited distally by row of spines, dorsal face with numerous, wellspaced small spines or tubercles. Left cheliped usually weakly calcified on dorsolateral surfaces of merus and carpus; palm unarmed except for scattered setae on dorsal face and long setae on dorsomesial margin; carpus with strong dorsodistal spine and long setae dorsally. Ambulatory legs with dactyl ( Fig. 10D View Fig ) each having ventromesial row of 7–9 slender corneous spines; carpus with small, blunt or sharp dorsodistal spine. Anterior lobe of sternite XII (between second ambulatory legs) rounded, setose, unarmed. Fourth pereopod with dactyl sexually dimorphic, longer, slenderer and more strongly curved in females than in males ( Fig. 10E, F View Fig ); propodal rasp with 1 row of rounded scales at least distally. Fifth pereopod propodal rasp extending to mid-length of segment. Uropods and telson markedly asymmetrical; telson ( Fig. 10J View Fig ) lacking transverse suture, posterior lobes separated by shallow cleft, terminal margin of lobes armed with long, often strongly curved corneous spines. Male lacking first gonopods; second pair of gonopods ( Fig. 10G–I View Fig ) weakly developed, asymmetrical, left usually 1-segmented or occasionally 2-segmented with short distal segment, right 1-segmented, rudimentary or absent. Female with vestigial second right pleopod.

Colouration. Unknown.

Habitat. Gastropod shells.

Distribution. Western Pacific, on the eastern coast of Australia, and the Philippines. Depth: 189–1150 m.

Remarks. Oncopagurus cidaris   is one of eight species of Oncopagurus   in which males lack first gonopods; the others are: O. haigae   , O. oimos   , O. orientalis   , O. tuamotu   , and four of the new species described herein, O. elevatus   , O. rossanae   , O., and O. brevis   . Although these eight species share that condition, they differ markedly in a number of characters, primarily from the epistome, cephalic appendages, right chela, ambulatory legs, and telson. The absence of first gonopods (presumably through loss) is a condition that appears to be the result of evolutionary convergence in the Parapaguridae   , as males of eight species of another genus, Paragiopagurus Lemaitre, 1996   , also lack first gonopods: P. acutus ( de Saint Laurent, 1972)   , P. bicarinatus ( de Saint Laurent, 1972)   , P. hirsutus ( de Saint Laurent, 1972)   , P. hobbiti ( Macpherson, 1983)   , P. ruticheles A. Milne-Edwards, 1891   , P. ventilatus Lemaitre, 2004   , P. trilineatus Lemaitre, 2013   , and P. orthotenes Lemaitre, 2013   .

As documented by Lemaitre (1996), the shape of the dactyl of the fourth pereopod is sexually dimorphic in Oncopagurus cidaris   , with females having distinctly longer dactyls and more strongly curved (hook-like) than in males.

Oncopagurus conicus Lemaitre, 2006   Figs. 10K–S View Fig , 51 View Fig

Oncopagurus conicus Lemaitre, 2006: 519   View Cited Treatment , figs 1–4 (type locality: New Caledonia, HALIPRO 1, sta C 858, 21°42'S, 166°41'E); McLaughlin et al., 2010: 39.

Type material. Holotype, New Caledonia, HALIPRO 1, sta C 858, 21°42'S, 166°41'E, 1000–1120 m, 20 March 1994: M 2.0 mm ( MNHN Pg. 7612). GoogleMaps  

Paratypes, New Caledonia, same sta as holotype: 2 F 2.0, 2.4 mm ( MNHN Pg. 7613); BIOGEOCAL, sta CP 214, 22°43'09'S, 166°27'19'E, 1590–1665 m, 9 April 1987: 1 M 2.1 mm, 1 F 1.8 mm, 1 ov F 2.1 mm ( NMNH Pg. 7614)   .

Additional material. None.

Diagnosis. Shield ( Fig. 10K View Fig ) longer than broad; rostrum broadly rounded, weakly produced, with short mid-dorsal ridge; lateral projections subtriangular, terminating in small spine. Ocular peduncles more than half length of shield, diminishing in width distally, somewhat inflated ventroproximally, with longitudinal row of long setae dorsally, corneas reduced, subconical, usually ending sharply ( Fig. 10L View Fig ). Ocular acicles subtriangular, each terminating in strong spine. Antennular peduncle ( Fig. 10K View Fig ) exceeding distal margin of cornea by at least 0.2 length of penultimate segment. Antennal peduncle ( Fig. 10K View Fig ) exceeding distal margin of cornea by about 0.2 length of fifth segment; fourth segment unarmed; second segment with dorsolateral distal angle terminating in strong, simple spine, mesial margin with spine on dorsodistal angle; first segment with lateral face unarmed or with small spine; acicle not reaching tip of acute cornea, mesial margin armed with 2–5 small spines; flagellum slightly exceeding extended right cheliped, with setae <1–3 flagellar articles in length. Third maxilliped with crista dentata armed with about 9 teeth diminishing in strength distally. Right cheliped ( Fig. 10M, N View Fig ) relatively slender, not operculate, with moderately dense setae on dorsal surfaces of carpus and chela, fingers nearly straight; dactyl set at weakly oblique angle to longitudinal axis of palm; palm longer than broad, dorsal surface with scattered small spines or tubercles, lateral face rounded or sometimes with dorsolateral margin weakly delimited by row of small spines, mesial face rounded, dorsomesial margin delimited by row of small blunt or sharp spines, ventral surface with scattered small tubercles; carpus with dorsolateral margin rounded, dorsal surface with scattered small spines or tubercles. Left cheliped sometimes weakly calcified dorsomedially on merus and carpus; palm unarmed except for dorsomesial and dorsolateral setae; carpus unarmed except for dorsodistal spine and long setae dorsally. Ambulatory legs with dactyls ( Fig. 10O View Fig ) each having ventromesial row of 4–7 slender, corneous spinules; carpi unarmed except for small dorsodistal spine, and long setae dorsally. Anterior lobe of sternite XII (between second ambulatory legs) subsemicircular, setose, with distinct spine. Fourth pereopod propodal rasp ( Fig. 10P View Fig ) with 1 row of rounded scales at least distally. Fifth pereopod propodal rasp extending to mid-length of segment. Uropods and telson ( Fig. 10S View Fig ) symmetrical or nearly so; telson lacking transverse suture, posterior margin separated by shallow or obsolete U-shaped cleft into rounded projections, each armed with about 4–7 corneous spines, some often ventrally curved. Male with paired first and second gonopods ( Fig. 10Q, R View Fig ); first gonopod with weakly concave distal lobe; second gonopod with distal segment having row of short bristles on lateral margin medially, and long setae on distomesial face. Female with short, uniramous, 1-segmented second right pleopod.

Colouration. Unknown.

Habitat. Scaphopod shells.

Distribution. So far known only from the New Caledonia region. Depth: 1000–1665 m.

Remarks. This species and three other congeners, Oncopagurus minutus   , and two new species, O. elongatus   and O. petilus   , have reduced or subconical corneas. In O. conicus   , the corneas typically are slender or acute distally and often terminate sharply ( Fig. 10K, L View Fig ), whereas in O. minutus   , O. elongatus   , new species, and O. petilus   , new species, the corneas are rounded distally ( Figs. 20B View Fig , 27B View Fig , 31A View Fig ). Oncopagurus conicus   can be readily differentiated from those three species and all others in the genus, by the symmetrical (or nearly so) uropods and telson. Also, in O. conicus   the right chela is not operculate, with the lateral face rounded or at most with a weakly defined dorsolateral margin; whereas in the other three species the chela is operculate, with a lateral face sharply defined by a row of spines.

QM

Queensland Museum

MNHN

Museum National d'Histoire Naturelle

NMNH

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Parapaguridae

Genus

Oncopagurus

Loc

Oncopagurus cidaris Lemaitre, 1996

Lemaitre, Rafael 2014
2014
Loc

Oncopagurus conicus

McLaughlin PA & Komai T & Lemaitre R & Rahayu DL 2010: 39
Lemaitre R 2006: 519
2006
Loc

Oncopagurus cidaris

McLaughlin PA & Komai T & Lemaitre R & Rahayu DL 2010: 39
Poore GCB 2004: 282
Davie PJF 2002: 88
Zhadan DG 1997: 63
Lemaitre R 1996: 204
1996